title: Fragile sites and X-linked retardation.
mesh_terms: D000293:Adolescent; D043283:Chromosome Fragile Sites; D002873:Chromosome Fragility; D005260:Female; D008040:Genetic Linkage; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D010375:Pedigree; D012729:Sex Chromosome Aberrations / Q000235:genetics; D012730:Sex Chromosomes; D013601:T-Lymphocytes / Q000648:ultrastructure; D014960:X Chromosome